William bahsay



DRY CELL Filed March 24, 1924 INVENTOR "M% K; ATTORNEY Patented Apr. 27,ldZfi.

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DRY CELL.

Application filed March 24, 1924;. Serial No. 701,451. i

have invented certain new and useful Im-.

movements in Dry Cells, of which the following is a specification.

This invention relates to dry cells and more particularly to an improvedlining or separator for dry cells.

In accordance-with the present invention the lining, by means of whichthe depolarizing mix is separated from the zinc electrode, consists ofalayer of manganese dioxideor material. The insulating qualities of suc1layer are sufiicient to answer the purpose and it the manganese dioxideis provided in a coarsely powdered form, it will be sufficiently ab- 1sorbent to hold a large quantity of liquid. Furthermore, some of themanganese dioxide, whichis in contact with the depolarizing mixture,will act as a depolarizer.

The invention is particularly applicable to dry cells of the type inwhich the depolarizing mixture consists of compacted tablets.

In such structures the manganese dioxide separation could be readily andcheaply applied by compacting it in the form of a coating partially orentirely surrounding the tablet. In order to prevent any migration offine graphite that iscontained in the depolarizing mix and'forstrengthening the suitable insulating material.

physical construction, the manganese dioxide used in the coatin ispreferably mixed with gelatinous matpriail such as gum t ragacanth,andhthe electrolyte may also be mixed therewit The drawing illustratesthe embodiment ofthe invention into a multiple cell.

In the drawing, 1 is a zinc can containing a plurality of compactedtablets 2 which are separated from each'other by means of zinc washers 3contacting with the zinc can 1. The bottom plate 4 of the can is of someEach tablet 2 is surrounded by'a relatively thin layer 5 of depolarizingmaterial. The tablets are centrally perforated, as are the washers 3,and a carbon electrode 6 projects through these central perforations.The cell is sealed at 7 in the usual manner. I

What is claimed is:

1. In a dry cell, a zinc container, 9. carbon ing said tablets andcontacting with the electrode therein, a mixture containing depolarizingand carbonaceous materials surrounding the carbon electrode, and a layerof depolarizing material separating said mixture from said container andcontacting therewith. I

2. In a dry cell, a zinc container, a carbon electrode therein, amixture of manganese dioxide and graphite surrounding the carbonelectrode, and a layer of manganese dioxide separating said mixture fromsaid container and contacting therewith.

3. In a dry cell, a zinc container, a carbon electrode therein, amixture of manganese dioxide and carbonaceous material surrounding thecarbon electrode, and a porous layer of manganese dioxide separatingsaid mix ture from said container and contacting therewith.

l. In a dry cell, a zinc container, a carbon electrode therein, amixture of manganese dioxide and carbonaceous material surrounding thecarbon electrode, and a layer of coarsely powdered manganese dioxidemixed with gum tragacanth separating said mixture from said container.

5. In a dry cell, tablets compacted of a mixture of depolarizing andconducting ma terials, a layer of depolarizing material compacted aroundeach tablet, an electrode projecting through said tablets, and a secondelectrode contacting with said-layer.

6. In a dry cell, tablets compacted of a mixture of manganese dioxideand carbon, a coating of manganese dioxide compacted around each tablet,a carbon electrode projecting through said tablets, and a zinc electrodesurrounding the tablets and contactin with said coating.

In a dry cell, a zinccylinder, a plurality of tablets compacted ofmanganese dioxide and graphite within said zinc container, a coating ofmanganese dioxide compacted around each tablet, a zinc cylindersurroundsides of said coating, zinc washers between adjacent tablets forcontacting with the upper and lower surfaces, respectively, of saidcoatings, and a carbonelectrode projecting through said tablets andwashers.

In testimony whereof, I have signed my name to this specification thisThursday, 20th day of March 1924.

WILLIAM RAMSAY.

